In Terry Pratchett's Wyrd Sisters, Granny Weatherwax teams with two other witches-Nanny Ogg and Margat Garlick-as an unlikely alliance to save a prince and restore him to the throne of Lancre, in a tale that borrows-or is it parodies-some of William Shakespeare's best-loved works.
Meet Granny Weatherwax, the most highly regarded non-leader a coven of non-social witches could ever have. Generally, these loners don't get involved in anything, must less royal intrigue. But then there are those times they can't help it. As Granny Weatherwax is about to discover, it's a lot harder to stir up trouble in the castle than some theatrical types would have you think. Even when you've got a few unexpected spells up your sleeve.
The Discworld novels can be read in any order but Wyrd Sisters is the sixth Discworld book and the second in the Witches collection. The Witches collection includes:

[*]Equal Rites
[*]Wyrd Sisters
[*]Witches Abroad
[*]Lords and Ladies
[*]Maskerade
[*]Carpe Jugulum